Thankyou Jois for the links, I am not that computer savy yet I am going to study what you have put up. Where I live calico is not printed and it is used for curtain backing and also in a better quality for quilting and craft. The seeded one is my particular old fashiond favourite but you can get several different widiths from 90cm up to 2.50m and many different qualities from cheap (spit peas through) to the craft quality which has a much bigger thread count.
Thankyou all very much I understand a lot better now.
Gal